I don't believe this is the case. Updating your username / password in the modem, yes. However logging into the actual router, it may be admin/admin admin/password or a custom user/pass to login to the router.

Most BigPond ADSL modems do not have a password to access the page however.

--------------------------------------------------------------------------I am both a Telstra Customer and a Telstra Employee.Some of my views may not represent Telstra and are my personal opinion only.